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New companies are working to commercialize in vitro gametogenesis, or IVG, a technology that could make human eggs and sperm in the lab from any cell in the body.
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Most fertility treatments have been put on hold following recommendations by the American Society for Reproductive Medicine, but some specialists and their patients argue they can't afford to wait.
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A small study of teens who were conceived via assisted reproductive technology finds a significant number already have hypertension and premature "age-related changes" in their blood vessels.